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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 4 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2012 | May 31, 2012 | Jan. 31, 2012 | May 31, 2011
Employee Benefit Plans (Textual) [Abstract] |  |  |  |
Maximum percentage of salary deferral under incentive retirement plan |  | 50.00% |  |
Percentage of employee pay eligible for employer matching contribution | 6.00% |  | 4.00% |
Percentage of eligible pay that is matched by the employer | 50.00% |  | 50.00% |
Company contributions to the Plan |  | $ 10.3 |  | $ 3.5
Deferred compensation plans contribution |  | Eligible employees can defer up to 50% of their annual base salary and bonus and outside directors can defer 100% of their Board cash compensation |  |
Percentage of annual base salary that eligible employees can defer |  | 50.00% |  |
Percentage of board cash compensation that may be deferred |  | 100.00% |  |
Amounts accrued under deferred compensation plans | $ 9.2 | $ 9.2 |  | $ 8.9

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 + Details
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